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Geometry and Trigonometry / Right triangles and trigonometry Difficulty: Hard

In the triangle shown, what is the value of $\cos x °$ ?

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Explanation

The correct answer is $StartFraction 11 Over 28 EndFraction$ . The cosine of an acute angle in a right triangle is defined as the ratio of the length of the leg adjacent to the angle to the length of the hypotenuse. In the triangle shown, the length of the leg adjacent to the angle with measure $x °$ is $11$ units and the length of the hypotenuse is $28$ units. Therefore, the value of $\cos x °$ is $StartFraction 11 Over 28 EndFraction$ . Note that 11/28, .3928, .3929, 0.392, and 0.393 are examples of ways to enter a correct answer.